It's the 30-day veteran award. You get it as soon as you pay for 30 day or more of subscription. Worthy of note, if you are in NA, you cannot pay (even with time card) for days until your free time is used up. But as soon as you pay for 30 days, you get the item. You can then use it to do a one-time race/sex/appearance change.

Kind of hoping they implement an option like that in the future. :c I tried to FF14-ify my FF11 name... and, despite how much I'm Trying to like this iteration, I just don't like it. :c She's already 30 on two jobs with a choco and all. -_- I don't know if I can stand to reroll again.